EP1339528A1 - Outil a main comportant un capteur destine a l'emission de signaux lors du remplacement de l'outil a main - Google Patents

Outil a main comportant un capteur destine a l'emission de signaux lors du remplacement de l'outil a main

Info

Publication number
EP1339528A1
EP1339528A1 EP01998426A EP01998426A EP1339528A1 EP 1339528 A1 EP1339528 A1 EP 1339528A1 EP 01998426 A EP01998426 A EP 01998426A EP 01998426 A EP01998426 A EP 01998426A EP 1339528 A1 EP1339528 A1 EP 1339528A1
Authority
EP
European Patent Office
Prior art keywords
drive shaft
hand tool
sensor
hand
tool according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP01998426A
Other languages
German (de)
English (en)
Other versions
EP1339528B1 (fr
Inventor
Harald Krondorfer
Markus Heckmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1339528A1 publication Critical patent/EP1339528A1/fr
Application granted granted Critical
Publication of EP1339528B1 publication Critical patent/EP1339528B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
    • B24B23/02—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor
    • B24B23/022—Spindle-locking devices, e.g. for mounting or removing the tool
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B45/00—Means for securing grinding wheels on rotary arbors
    • B24B45/006—Quick mount and release means for disc-like wheels, e.g. on power tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation

Definitions

  • the invention is based on a hand tool according to the preamble of claim 1.
  • a locking device which has a locking bolt which is guided in a housing in a rotationally fixed manner relative to the drive shaft and which can be brought into engagement with a toothing connected to the drive shaft in a rotationally fixed manner via an actuating key.
  • a grinding machine tool holder for a hand-held angle grinding machine is known from EP 0 904 896 A2.
  • the angle grinder has a drive shaft that has a thread on the tool side.
  • the grinding machine tool holder has a driver and a clamping nut.
  • the driver is pushed with a mounting opening onto a collar of the drive shaft and clamped non-positively against a bearing surface of the drive shaft via the clamping nut.
  • the driver has a collar which extends in the axial direction on the tool side and which has radially recesses on its outer circumference on two opposite sides which extend in the axial direction to a base of the collar.
  • a groove extends in each case against the drive direction of the drive shaft on the outer circumference of the collar.
  • the grooves are closed against the drive direction of the drive shaft and taper axially from the recesses against the drive direction of the drive shaft.
  • the grinding wheel has a hub with an assembly opening in which two opposite, radially inward-pointing tongues are arranged.
  • the tongues can be axial
  • the grinding wheel is positively locked over the tongues in the grooves in the axial direction and is non-positively fixed due to the tapering contour of the grooves.
  • the frictional connection increases due to reaction forces acting on the grinding wheel, which act counter to the drive direction.
  • a stopper which is movably mounted in an opening in the axial direction. In a working position with the grinding wheel facing downwards, the stopper is deflected axially by gravity in the direction of the grinding wheel, closes the groove in the direction of the recess and blocks a movement of the tongue located in the groove in the drive direction of the drive shaft.
  • the invention relates to a hand-held power tool, in particular a hand-held angle grinder or circular saw, with a driving device, by means of which an insert tool can be operatively connected to a drive shaft.
  • Insert tool can be detected and a signal can be triggered.
  • operation of the handheld power tool can be excluded and safety can be increased, in particular by the operation of the driving device being prevented via the signal.
  • various sensors which appear useful to the person skilled in the art can be used, such as, for example, electrical, mechanical and / or electromechanical sensors, etc., which can trigger various signals, such as, for example, electrical, mechanical, optical and / or acoustic Signals etc.
  • the operation of the driving device can be prevented by various constructive solutions, for example via a mechanical and / or electromechanical coupling, etc., which can be combined with a locking device of a drive shaft. If a voltage supply can be prevented via the signal, for example via an electrical sensor and a switch, the operation can be prevented with a particularly space-saving and lightweight construction.
  • a light source can advantageously be designed to be switchable via the signal, for example a warning light which signals to an operator a change or a change that has not yet been carried out completely and / or to illuminate the driving device, as a result of which assembly and disassembly of one in dark rooms Insert tool can be simplified.
  • the insert tool can be operatively connected to the entraining device via at least one latching element movably mounted against a spring element, which engages in an operating position of the insert tool and fixes the insert tool in a form-fitting manner, and at least one position via the sensor of the locking element can be detected.
  • a high level of security can be achieved by the positive connection and a simple and inexpensive tool-free quick-action clamping system can be created and the sensor can be easily integrated.
  • the movement of the locking element can be detected directly or indirectly via a component that is moved with the locking element. Unintentional running of the insert tool can be avoided by the positive locking, even with braked drive shafts, where large braking torques can occur.
  • the sensor is actuated via a cable pull and / or via a lever gear, etc.
  • a large deflection of the latching element can be made possible during assembly of the insert tool, whereby on the one hand a large overlap between two corresponding latching elements and a particularly secure form fit can be realized and on the other hand a clearly audible latching noise can be achieved, which is an operator advantageously indicates that the latching process has been completed as desired.
  • the movably mounted latching element can be designed in various forms that appear useful to the person skilled in the art, for example as an opening, projection, pin, bolt, etc., and can be arranged on the insert tool or on the driving device.
  • the latching element can itself be movably mounted in a component in a bearing, for example in a flange of the driving device or in a tool hub of the insert tool.
  • the latching element can also advantageously be firmly connected to a component movably mounted in a bearing point, positively and / or cohesively or be made in one piece with it, for example with a component mounted on the drive shaft or with a tool hub of the insert tool.
  • the driving device can at least partially be designed as a releasable adapter part or can be non-releasably connected to a drive shaft in a force-fitting, form-fitting and / or material-locking manner.
  • the latching element can be designed to be movable in different directions against a spring element, such as, for example, in the circumferential direction or particularly advantageously in the axial direction, as a result of which a structurally simple solution and an actuating movement which can be easily detected by the sensor can be achieved.
  • a particularly inexpensive, robust and structurally simple solution can also be achieved in that an electrical switching element forming the sensor can be actuated via the latching element. If the switching element is arranged in a rotationally fixed or housing-fixed manner with respect to an axis of rotation of the drive shaft, an additional rotating mass and complex contact connections between components rotating relative to one another can be avoided. However, at least individual parts can also be made rotating, for example in the area of an actuation button.
  • the drive shaft can be locked via an actuation button of a locking device for changing the insert tool and a position of the actuation button can be detected via the sensor. Additional components can be saved and a safe signal can be achieved.
  • the drive shaft can be locked electrically and / or electromagnetically etc. via the signal.
  • the actuation button be operatively connected in the direction of rotation to the drive shaft and at least one first part operatively connected to the drive shaft in the direction of rotation can be connected to a second part which is rotationally fixed with respect to an axis of rotation of the drive shaft via the actuation button for locking the drive shaft.
  • the actuating button rotating with the drive shaft during operation can reliably prevent the actuating button from being misused to brake the drive shaft. A running out of the application tool due to an unintended large braking torque and a consequent one
  • the solution according to the invention can be used in various hand-held power tools which appear to be useful to a person skilled in the art, such as, for example, eccentric grinders, orbital sanders, brushes, drills, etc., but is particularly advantageous in hand-held circular saws and in angle grinders, in which uncontrolled rotating insert tools are particularly heavy Can cause injuries.
  • Fig. 2 shows a schematic cross section along the
  • Fig. 1 shows an angle grinder from above with an electric motor, not shown, mounted in a housing 42.
  • the angle grinder can be guided via a first handle 44, which extends in the longitudinal direction and is integrated in the housing 42 on the side facing away from a cutting disc 16, and via a second handle 48 which is attached to a gear housing 46 in the region of the cutting disc 16 and extends transversely to the longitudinal direction ,
  • a drive shaft 18 can be driven via a transmission (not shown in more detail), on the end of which facing the cutting disc 16 a driving device 12 is arranged (FIG. 2).
  • the driving device 12 has on a side facing the cutting disc 16 a driving flange 50 firmly pressed onto the drive shaft 18 and on a side facing away from the cutting disc 16 a driving disc 40 which is axially displaceable on the drive shaft 18 against a concentrically arranged coil spring 28.
  • pins 52 which are evenly distributed in the circumferential direction 32, 34 and extend in the axial direction 38 over the bearing surface 56, are axially displaceable for axially fixing the cutting disc 16 in the axial direction 38 against a plate spring 102.
  • the pins 52 each have at their end facing the cutting disc 16 a head which has a larger diameter than a remaining part of the pin 52 and on a side facing the driving flange 50 a conical bearing surface 104 tapering in the axial direction 36 and a parallel has bearing surface 104a extending to the bearing surface 56.
  • the driving flange 50 forms an axial bearing surface 56 for the cutting disc 16, which defines an axial position of the cutting disc 16 and in which recesses 58 are made in the area of the pins 52. Furthermore, in the circumferential direction 32, 34, three axial through bores 60 are made in the driving flange 50, evenly distributed over the circumference.
  • drive plate 40 In the axially displaceably mounted on the drive shaft 18 drive plate 40 three bolts 30 are pressed in the circumferential direction 32, 34 in succession, which in the axial direction 38 to the cutting disc 16 and with a part 24 in the axial direction 36 facing away from the cutting disc 16 via the Mit - slave plate 40 extend.
  • the driving plate 40 is pressed by the helical spring 28 in the direction 38 to the cutting disc 16 against the driving flange 50 and is supported on the latter.
  • the bolts 30 protrude through the through bores 60 and extend in the axial direction 38 over the driving flange 50.
  • the driving device 12 has a pot-shaped unlocking button, which is arranged centrally on the side facing the cutting disc 16 and is made in one piece with an actuating button 22 of a locking device 20 of the drive shaft 18.
  • the unlocking button has three segments 62 which are evenly distributed in the circumferential direction 32, 34 and which extend in the axial direction 36 to the axially movably mounted driving plate 40, which engage through corresponding recesses 64 in the driving flange 50 and via a snap ring 66 in the driving plate 40 in the axial direction 38 are secured against falling out.
  • the release button is guided in an annular recess 68 in the driving flange 50 so as to be displaceable in the axial direction 36, 38.
  • the cutting disc 16 has a sheet metal hub 70 which is firmly connected and pressed with an abrasive 72 via a rivet connection (not shown) (FIG. 3).
  • the tool hub could also be made of another material which appears to be useful to the person skilled in the art, such as plastic, etc.
  • the sheet metal hub 70 has three evenly distributed bores 74, 76, 78 in the circumferential direction 32, 34, the diameter of which is slightly larger than the diameter of the bolts 30. Furthermore, the sheet metal hub 70 has three uniformly in the circumferential direction 32, 34 distributed, extending in the circumferential direction 32, 34.
  • elongated holes 80, 82, 84 each having a narrow area 86, 88, 90 and a wide area 92, 94, 96 produced by a bore, the diameter of which is slightly larger than that Diameter of the heads of the pins 52.
  • the sheet metal hub 70 has a centering bore 98, the diameter of which is advantageously selected such that the cutting disc 16 can also be clamped on a conventional angle grinding machine using a conventional clamping system with a clamping flange and a spindle nut. So-called downward compatibility is ensured.
  • the cutting disc 16 is then rotated until the pins 52 engage in the wide areas 92, 94, 96 of the elongated holes 80, 82, 84 of the sheet metal hub 70 provided for this purpose. Pressing the sheet metal hub 70 against the bearing surface 56 of the
  • Driving flange 50 causes the bolts 30 in the through bores 60 and the driving disk 40 to be axially displaced against the spring force of the helical spring 28 on the drive shaft 18 in the direction 36 facing away from the cutting disk 16.
  • the part 24 of the bolts 30, which in the axial direction 36 facing away from the cutting disc 16 via the center protruding disk 40, is pushed into a molded on a bearing cap 100, a plurality of pockets 26 distributed in the circumferential direction 32, 34.
  • the bearing cover 100 is screwed tightly into the gear housing 46.
  • the pockets 26 are mounted in a rotationally fixed manner with respect to an axis of rotation of the drive shaft 18 or relative to the drive shaft 18 and are closed in the direction of rotation, and the drive shaft 18 is positively locked in the circumferential direction 32, 34 via the driving flange 50 and the bolts 30.
  • a sensor 10 In the area of the entraining device 12, in a pocket 26 of the bearing cover 100, a sensor 10 is arranged in a rotationally fixed manner with respect to an axis of rotation of the drive shaft 18, by means of which assembly and disassembly of the cutting disc 16 can be detected.
  • an electrical switching element 14 forming the sensor 10 By immersing the bolt 30 in the pocket 26, an electrical switching element 14 forming the sensor 10 is actuated via the bolt 30.
  • a signal is triggered, via which a voltage supply to the angle grinder is interrupted and the operation of the angle grinder or the driving device 12 is reliably prevented.
  • the pockets 26 are designed to be open radially inwards, which can prevent them from becoming clogged with dirt and dust.
  • the pockets 26 could also advantageously be designed to be open in the axial direction 36 facing away from the cutting disc 16.
  • a further rotation of the sheet metal hub 70 counter to the drive direction 34 causes the pins 52 to be displaced into the arcuate, narrow areas 86, 88, 90 of the elongated holes 80, 82, 84.
  • the pins 52 are axially pressed against the pressure of the plate 102 shifted in the direction 38 until the contact surfaces 104a of the pins 52 overlap the edges of the elongated holes 80, 82, 84 in the arcuate, narrow regions 86, 88, 90.
  • the plate springs 102 press the cutting disc 16 against the bearing surface 56 via the contact surfaces 104a of the pins 52.
  • the pins can also be loaded by other spring elements which appear sensible to a person skilled in the art, such as, for example, coil springs or one disc spring, not shown, extending over the entire circumference.
  • the illustrated embodiment with the axially displaceably mounted pins 52 is particularly suitable for thick and / or slightly elastically deformable tool hubs.
  • the bores 74, 76, 78 in the sheet metal hub 70 come to rest over the through bores 60 of the driving flange 50.
  • the bolts 30 are axially moved by the spring force of the helical spring 28 in the direction 38 of the
  • Cutting disc 16 moved out of the pockets 26, engage in the holes 74, 76, 78 of the sheet metal hub 70 and fix it in a positive manner in both circumferential directions 32, 34. When engaging, there is an audible engaging noise that signals that the operator is ready for operation.
  • the electrical switching element 14 forming the sensor 10 is actuated, and the voltage supply to the angle grinder is restored.
  • a drive torque of the electric motor of the angle grinder can be transmitted non-positively from the drive shaft 18 to the driving flange 50 and from the driving flange 50 positively via the bolts 30 to the cutting disc 16.
  • a braking torque which occurs when and after the electric motor is switched off and which is opposite to the drive torque can be positively transmitted from the driving flange 50 via the bolts 30 to the cutting disc 16.
  • Undesired loosening of the cutting disc 16 is reliably avoided.
  • the release button is pressed.
  • the drive plate 40 is displaced with the bolts 30 via the unlocking key or actuation key 22 against the helical spring 28 in the axial direction 36 facing away from the cutting disc 16, as a result of which the bolts 30 move in the axial direction 36 out of their locking position or out of the bores 74 , 76, 78 of the sheet metal hub 70 move.
  • the bolts 30 engage with their parts 24 in the pockets 26, as a result of which the drive shaft 18 is positively locked in the direction of rotation 32, 34.
  • the electrical switching element 14 forming the sensor 10 is actuated by immersing the bolt 30 into the pocket 26 via the bolt 30.
  • a signal is triggered, via which the voltage supply to the angle grinder is interrupted and the operation of the angle grinder or the driving device 12 is reliably prevented.
  • the cutting disc 16 is then rotated in the drive direction 34, namely until the pins 52 come to rest in the broad areas 92, 94, 96 of the elongated holes 80, 82, 84 and the cutting disc 16 is removed from the driving flange 50 in the axial direction 38 can.
  • the drive plate 40, the bolt 30 and the release button or actuation button 22 are moved back into their starting positions by the helical spring 28.
  • the electrical switching element 14 forming the sensor 10 is actuated and the voltage supply to the angle grinder is restored.

Abstract

L'invention concerne un outil à main, en particulier une meuleuse d'angle ou une scie circulaire manuelles, comportant un système d'entraînement (12) permettant de relier activement un outil interchangeable (16) à un arbre d'entraînement (18). Selon l'invention, au moins un capteur (10) relève au moins une opération lors du remplacement d'un outil interchangeable (16), et déclenche un signal.
EP01998426A 2000-12-01 2001-10-26 Outil a main comportant un capteur destine a l'emission de signaux lors du remplacement de l'outil a main Expired - Lifetime EP1339528B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10059712 2000-12-01
DE10059712A DE10059712A1 (de) 2000-12-01 2000-12-01 Handwerkzeugmaschine
PCT/DE2001/004064 WO2002043920A1 (fr) 2000-12-01 2001-10-26 Outil a main comportant un capteur destine a l'emission de signaux lors du remplacement de l'outil a main

Publications (2)

Publication Number Publication Date
EP1339528A1 true EP1339528A1 (fr) 2003-09-03
EP1339528B1 EP1339528B1 (fr) 2006-06-14

Family

ID=7665401

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01998426A Expired - Lifetime EP1339528B1 (fr) 2000-12-01 2001-10-26 Outil a main comportant un capteur destine a l'emission de signaux lors du remplacement de l'outil a main

Country Status (6)

Country Link
US (1) US6860792B2 (fr)
EP (1) EP1339528B1 (fr)
JP (1) JP2004513800A (fr)
CN (1) CN1196564C (fr)
DE (2) DE10059712A1 (fr)
WO (1) WO2002043920A1 (fr)

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Also Published As

Publication number Publication date
JP2004513800A (ja) 2004-05-13
US20030176147A1 (en) 2003-09-18
EP1339528B1 (fr) 2006-06-14
WO2002043920A1 (fr) 2002-06-06
US6860792B2 (en) 2005-03-01
DE10059712A1 (de) 2002-06-20
CN1396853A (zh) 2003-02-12
CN1196564C (zh) 2005-04-13
DE50110177D1 (de) 2006-07-27

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